Concept
Testnets until a reviewed change says otherwise
Execution defaults to testnets; moving to a live chain is a reviewed, deliberate change, never a default a misconfiguration can trip into.
Pinned to
Tether WDK + wdk-policy-guard — the execution layerThe canonical source this concept is taught from. If it moves, the lesson is regenerated — teaching is pinned to code, not retyped.
On the frontier
No course teaches this concept yet — it is a named gap on the content graph, not a hole nobody sees. A gap is the roadmap, not an embarrassment: the count only falls by teaching.